fixed broken isinstance tests
fixed broken isinstance tests

tjwei/jedi,flurischt/jedi,jonashaag/jedi,jonashaag/jedi,dwillmer/jedi,WoLpH/jedi,WoLpH/jedi,mfussenegger/jedi,tjwei/jedi,flurischt/jedi,mfussenegger/jedi,dwillmer/jedi